Answer:
A weighing scale
Step-by-step explanation:
A weighing scale graduated in grams or kilograms can be used.
This depends on how big the bag is. Most commonly, the bag weighs 2 kg to 10 kg or more. With this range of weight, Siobhan should use a balance to measure the mass of the flour and record the mass in kilograms. Thus, the answer is the first choice
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